javascript 使用数组绘制 D3 简单折线图
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StackOverFlow
Draw D3 Simple Line chart With an Array
提问by M.N
I am Trying to Implement this code: http://bl.ocks.org/3883245, but instead of loading a TSV file, i am loading the data from an array. Here is how the array looks Like:
我正在尝试实现此代码：http: //bl.ocks.org/3883245，但我不是加载 TSV 文件，而是从数组加载数据。这是数组的样子：
[["2012-10-02",2],["2012-10-09", 2], ["2012-10-12", 2]]
and then I applied this function on it to get CSV Format: var data = d3.csv.format(BigWordsDates2[ArrayIndex]);
然后我在它上面应用了这个函数来获得 CSV 格式： var data = d3.csv.format(BigWordsDates2[ArrayIndex]);
but still nothing shows up.
但仍然没有出现。
Here is the whole code: I think I am not that far from getting it but I have been working on it for 3 days and still cant get it to work:
这是整个代码：我想我离得到它不远了，但我已经研究了 3 天，但仍然无法让它工作：
var margin = {top: 20, right: 20, bottom: 30, left: 50},
width = 80 - margin.left - margin.right,
height = 80 - margin.top - margin.bottom;
var data = d3.csv.format(BigWordsDates2[ArrayIndex]);
var parseDate = d3.time.format("%Y-%b-%d").parse;
var x = d3.time.scale()
.range([0, width]);
var y = d3.scale.linear()
.range([height, 0]);
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(y)
.orient("left");
var line = d3.svg.line()
.x(function(d) { return x(d.date); })
.y(function(d) { return y(d.close); });
var svg = d3.select("#Graph").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
d3.csv.parseRows(data, function(data) {
data.forEach(function(d) {
d.date = parseDate(d.date);
d.close = parseInt(d.close);
});
x.domain(d3.extent(data, function(d) { return d.date; }));
y.domain(d3.extent(data, function(d) { return d.close; }));
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
svg.append("g")
.attr("class", "y axis")
.call(yAxis)
.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", ".71em")
.style("text-anchor", "end")
.text("Price ($)");
svg.append("path")
.datum(data)
.attr("class", "line")
.attr("d", line);
});`
I think I am also doing something wrong with the d.date and d.close but I can't figure it out either.
我想我在 d.date 和 d.close 上也做错了，但我也想不通。
回答by jaime
The chart uses data in the following format
该图表使用以下格式的数据
[{ date: '...', close: '...'},
{ date: '...', close: '...'}]
So, you need to parse your array:
所以，你需要解析你的数组：
// fix your data parser
var parseDate = d3.time.format("%Y-%m-%d").parse;
var arrData = [
["2012-10-02",200],
["2012-10-09", 300],
["2012-10-12", 150]];
// create a new array that follows the format
var data = arrData.map(function(d) {
return {
date: parseDate(d[0]),
close: d[1]
};
});
Here's the working version: http://jsfiddle.net/jaimem/T546B/
这是工作版本：http: //jsfiddle.net/jaimem/T546B/
pd: depending on the data you might have to modify your yscale's domain.
pd：根据数据，您可能需要修改y秤的域。
